Rotary pump and the like.



A E. LOLE.

' ROTARY PUMP AND THE LIKE.

APPLlCATlON FILED DEC. I8, I917- 1,291,037 Patented Ja11.14,1919.

2 SHEETS-SHEET I.

A. E. LOLE.

ROTARY PUMP AND THE LIKE.

APPLICATION FILED 056.113.1911.

Patented Jan. 1 1, 1919.

2 SHEETS-SHEET 2.

- ALFRED :ERNES'IILQLE, or JseKsnALE, L ND.

Y ROTARY PUMP A-Nd) THE rm.-

Specification of Zetters Patent. r. Patented J an; 14

Appli-cation filed December 1a. 1917. "SerialNo, 207,777. fi

To all whom e'tmay concern: I

Beit known that I, ALFRED-ERNEST LOLE, a subject of the King of the United Kingdom of *GreatBritain' and'Ireland,ai1d residing at lacksdalain the county of Nottingham, England, have invented. a certain new and useful Improvement in Rotary Pumps and the like, of which the following is a specification.

"This invention relates to improvements in rotary "fluid pumps of the centrifugal type, and its object is' to increase their efficiency, and more particularly to obviate the destructive action of the fluid on the impeller and the interiorof the casing.

Referring-to the accompanying drawings, Figure 1 is a sectional side view of a centrifugal pump as ordinarily constructed. Figfi2-is a sectional side view of a rotary pump of the same type constructed according to'the invention. Fig. 3 is a detail view of a web or extensionshowin'g the triangular discharge outlet. Fig. 4 is a sectionalelevationof the improved pump. Fig. 5 is a sectional side view, showing the invention applied to the fluid pump of an air extractor of the Leblanc type. Fig-6 is a sectional view on line 66,Fig. 5,'of the outer casing, looking toward the discharge opening in said casing, and'Figf'Z'is a detail view o'f'theiinner casing showing the shape of the water inlet.

In centrifugal fluid pumps of modern construction of which the impeller is fitted with tangentially disposed blades and is mounted for rotation in a volute shaped casing, as shown in Fig. 1, serious destructive action is set up when a certain pressure or head of water is exceeded, and the height to which water can be raised by such pumps with economy is therefore restricted.

The destructive action referred to takes the form of pitting, perforating and bulging of the blades A of the impeller A. and pitting of the interior of the casing B, from b to 0, leading ultimately to complete perforation. This action is believed to be partly due to the instantaneous cut-off of the delivery of the fluid from each of the impeller blades A, owing to the disposition and form of the inner side 0' of the discharge opening 0, and the form of the interior of the casing from b to 0 resulting in vibration and unequal velocity in the volume of fluid discharged into the delivery pipe D, which causes a proportion of that fluid to return to thecasing B againthrough'the gap E-into the space "13, where it forms eddies which meet the impeller bladesAi' again, and", set up water hammer action."

" According to this invention *the mainldis' charge opening C (Fig. 2) into' the tangen' tia-l delivery pipe D is situated are instead of at the usual'point'b, 5the space between a and Z) is occupied by an abutment orwa'll'or web 'F extending from the casing B, tl'ieinterior face of which wallor web is'prefer'ably concentric with the impeller A, said wall 01- web being provided with an inverted shaped opening G forming a continuation or ex'tensiono'f the discharg'eopeningC This opening G is continued with a gradually decreasing Width in the direction of rotation of the impeller or rotor A from-a to the point 6 Where it'term-inates. The opening G is approximately in theiform of an isosceles'trr angle, as shown more clearly' in Fig-3; the base of which is at asand the "apex at b, so that the impeller blades A, when zpassing said opening-"G,i-move from; the wider end" "to the narrower end, "andithe delivery from each impeller -bladeA "is thu'scu't 'offgrad ually, instead 'o'finstantaneously as in existing fluid pumps such as-"shownwin'Fig; 1.

The interior face of the casing B is also preferably concentricwiththe impeflerfrom the point 6, where the opening G terminates, up to the point a, or about one sixth of its circumference, in order to prevent the possibility of water returning from the delivery pipe D to the casing B.

The construction permits reduction of the area of the discharge opening C approximately to the capacity of each impeller blade A, without afl'ecting the efliciency of the pump or volume of fluid the pump will raise, and it helps to give the ideal conditions of working, that is, the maintenance of a uniform velocity of the fluid at the discharge opening.

With the arrangement shown inFigs. 2 to 4 the fluid maintains a constant velocity until it has passed the end of the opening G, and it has been proved in practicethat the destructive action, whether due to the particular cause previously stated or not, is entirely obviated by the construction described quantity can be raised with the expenditure of less power. I 7

In Figs. 5 to 7 the invention is shown as applied to the fluid pump of an air extractor of the well known Leblanc type, in which air is extracted by the injector action of water.

In this construction the outer casing K inclosing the impeller or rotor Kisprovided with a discharge r-opening L having a- V-shaped extension L, the inner face of said casing being concentric with said impeller or rotor K, said discharge opening L, L diminishing gradually in the direction of rotation of the impeller or rotor so as gradually to cut ofl the delivery from each impeller blade. In this construction the action of the arrangement described may be assisted by having the discharge opening II to the impeller or rotor K communicate with an extension J which is formed in the interior wall J and is V-shaped in similarity to the V-shaped extension L, and which extension J also diminishes radually in the direction of rotation of the impeller or rotor K.

What I claim is 1. In a centrifugal fluid pump, incombination, a rotary impeller, a casing inclosing said impeller and having at its delivery a wall or web concentric with said impeller, said wall or web being formed with an opening of gradually reduced width in the direction of rotation of said impeller.

2. In a centrifugal fluid pump, in combination, a rotary impeller, a casing inclosing said impeller, and an adjoining delivery pipe, said casing having a wall or web conc0 15 0! this patent may be obtained for side five cents each, by addressing the W shington, D- 0" centric with said impeller and formed with an opening extending from its free extremity and gradually reduced in the direction of rotation of said impeller.

3. In a centrifugal fluid pump, nation, a rotary impeller, said impeller, pipe, said casing having a wall or web concentric with said impeller, said wall or web being formed with an opening of the form of an isosceles triangle, the base of the triin combi-' a casing inclosing and an adjoining delivery angular opening bemg at the free extremity of said wall or web and the apex thereof at the junction of said casing and said delivery PIPE,

a. In a centrifugal pump, in combination, a rotary impeller, a casing for said impeller, and an adjoining delivery pipe, said casing being provided with an extension or web concentric wlth said impeller, said extension or web being formed with a discharge opening extending from its free end to the j unction ofsaid casing and said delivery pipe and of gradually reduced width in the direction of rotation of said impeller, said casing having an inner wall continuous with said extension or web and concentric with said impeller for a distance at least equal to about one sixth of its circumference.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

J ALFRED ERNEST LOLE. WVitnesses: 7

HENRY MASON, FLoRnNor: Hoos'roN.

Gommiuioler o! lat ants, 

